Answer:
C. a whale's flipper and a cat's leg
Explanation:
Homologous structures are the organs which have same basic anatomical structure but they perform different function based on the type of environment in which the organism is living. Two organisms which have homologous organs indicate that both the organisms are evolutionarily closely related to each other i.e. their ancestry is common. It is basically divergent evolution which is responsible for formation of homologous organs. If two closely related organisms are living in different environment then their organs which basically have same origin will tend to perform different functions as a part of adaptation. In contrast to this, analogous structures are the ones which perform similar function but anatomically they are very different and evolutionarily they are not closely related. Analogous structures are evolved as a result of convergent evolution which is meant for adaptation in a particular environment. So, even if two organisms are not closely related they still develop the structures which perform similar function so as to adapt into a particular environment.
Whales and cats both are mammals so they are closely related to each other but since they live in different environment, their organs which are anatomically similar perform different functions. Flippers in whales help in swimming while cat's leg help in walking. So, option C is correct answer.
All other options are examples of analogous organs.
A bird's wings and a butterfly's wings are perfect example of analogous organs. A bird is a vertebrate while a butterfly is an arthropod so evolutionarily they are very distantly related so their wings are also anatomically very dissimilar but they still perform similar function which help these two organisms in flying. So option A is incorrect. Similarly option D is also incorrect because wasp is an arthropod while dolphin is a vertebrate. Option B is also incorrect because catfish is a vertebrate and bee is an arthropod.
The spinal cord carries out two main functions: It connects a large part of the peripheral nervous system to the brain. Information (nerve impulses) reaching the spinal cord through sensory neurons are transmitted up into the brain.
Answer: Types of freshwater biomes include ponds, lakes, streams, rivers, and even some wetlands. (Wetlands are not always considered freshwater biomes because they usually have too high of a salt content.) Lakes and ponds are considered still water since they do not move very fast.
Explanation:
<span>Blood pH decreases
For this problem you need to remember what pH is. The higher the molarity of hydrogen ions, the lower the pH, or the more acid the solution is. The lower the molarity of hydrogen ions, the higher the pH, or the more basic the solution is. Now consider the question. You're having fewer hydrogen ions being secreted into the filtrate. That means that the substance being filtered has it's hydrogen ion concentration increasing. And the substance being filtered is blood. And since the hydrogen ion concentration is increasing, the pH is decreasing. So the answer is "Blood pH decreases".</span>
